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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
पर्याय
oxygen
hydrogen
nitrogen
water-vapour
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उत्तर
hydrogen
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Explain the following giving an example.
Pure substance
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Write true or false for the statement.
Deforestation is a man-made change
Write true or false
Burning of sugar is a temporary change.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
